Here's a discussion email from Nigel when I was going to switch from e85 to 110.

"I don't quote power numbers due to the huge variables from dyno to dyno. But, I can tell you E85 will make more power then 110 easily. On larger turbo setup it can potentially allow you to make close to 100 more WHP, or even more on more extreme setups, on E85 compared to 110."

Here's a discussion email from Nigel when I was going to switch from e85 to 110.

"I don't quote power numbers due to the huge variables from dyno to dyno. But, I can tell you E85 will make more power then 110 easily. On larger turbo setup it can potentially allow you to make close to 100 more WHP, or even more on more extreme setups, on E85 compared to 110."

I heard about Shell URT (Unleaded Racing Technology?) about a year ago...I think its rated at about 110Oct and they claim it performs better than c16. But I don't know if any SRTs that have tried it. I was going to test it, but never got a chance to.